Adding Numbers Within 100 With Regrouping

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Let's just dive right in and do one!

Just like before, stack and line things up:

<< Now, I'm going to make my stripes taller...

You'll see why in a second!

First, add the ones:

This is called "regrouping" since we had to put the tens guy in the next stripe over with all the other tens guys! Way back when I learned this stuff, it was called "carrying." Of course, we didn't have cell phones or DVD players back then either!